The influence of tyre cavity resonances on the exterior noise

Rolling noise due to tyre/road interaction is mostly explained by tyre vibrations. The contribution of air-pumping might be an important contributor for certain cases. This observation has often been based on evaluating the speed exponent observed in measurements of the radiated sound. However simulations show that in many cases the observed speed exponent can be explained by tyre vibrations. In addition simulation show that for rough roads the resonances in the tyre cavity can play an important role. In the paper the influence of sound generation in the tyre cavity is discussed in more detailed. For this the Chalmers Tyre/Road Interaction model is utilized. The simulations clearly show the contribution of tyre cavity resonances to rolling noise as function of surface type. The results indicate that additional damping in the cavity would not only be beneficial for the interior noise inside the vehicle but especially for rough road also for the exterior rolling noise due to tyre/road interaction.